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Showing content from https://github.com/rust-lang/rust/issues/41414 below:

`catch` blocks are not `Ok`-wrapping their value · Issue #41414 · rust-lang/rust · GitHub

Opening as #39849 (linked from tracking issue #31436) is closed.

From https://github.com/rust-lang/rfcs/blob/master/text/0243-trait-based-exception-handling.md#catch-expressions

If no exception is thrown, then the result is Ok(v) where v is the value of the block.

The current implementation does not; the following does not compile (2017-04-18):

let _: Result<i32, ()> = do catch { 4 };

Error message:

error[E0308]: mismatched types
 --> src/main.rs:3:41
  |
3 |     let _: Result<i32, ()> = do catch { 4 };
  |                                         ^ expected enum `std::result::Result`, found integral variable
  |
  = note: expected type `std::result::Result<i32, ()>`
             found type `{integer}`

Runnable: https://play.integer32.com/?gist=4e589a7b8f2ffff23f507fb66ac7f662&version=nightly

cc @nikomatsakis, who mentioned this in rust-lang/rfcs#1859 (comment)

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